User guide

Working with Inter-App Audio

In its most basic form, inter-app audio allows one app, called the node app, to send its audio output to another

app, called the host app. However, it is also possible for the host app to send its output to the node app, have

the node app process the audio, and send the result back to the host app. The host app needs to have an

active audio session; however, the node app only needs an active audio session if it is receiving input from the

host app or the system. Use the following guidelines when setting up inter-app audio:

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Set the “inter-app-audio” entitlement for both the host and node app.

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Set the UIBackgroundModes audio flag for the host app.

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Set the UIBackgroundModes audio flag for node apps that use audio input or output routes while

simultaneously connected to an inter-app audio host.

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Set the AVAudioSessionCategoryOptionMixWithOthers for both the host and node app.

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Make sure the node app’s audio session is active if it receives audio input from the system (or sends audio

output) while simultaneously connected to an inter-app host.

Defining an Audio Session

Working with Inter-App Audio